Before and after
But evidence of ongoing contamination continues to mount.
Crustacean biologist Darryl Felder, in the Department of Biology with the University of Louisiana at Lafayette is in a unique position.
Felder has been monitoring the vicinity of BP's blowout Macondo well both before and after the oil disaster began, because, as he told Al Jazeera, "the National Science Foundation was interested in these areas that are vulnerable due to all the drilling".
"So we have before and after samples to compare to," he added. "We have found seafood with lesions, missing appendages, and other abnormalities."
Felder also has samples of inshore crabs with lesions. "Right here in Grand Isle we see lesions that are eroding down through their s . We just got these samples last Thursday and are studying them now, because we have no idea what else to link this to as far as a natural event."
According to Felder, there is an even higher incidence of s disease with crabs in deeper waters.
"My fear is that these prior incidents of lesions might be traceable to microbes, and my questions are, did we alter microbial populations in the vicinity of the well by introducing this massive amount of petroleum and in so doing cause microbes to attack things other than oil?"
One hypothesis he has is that the waxy coatings around crab s s are being impaired by anthropogenic chemicals or microbes resulting from such chemicals.
"You create a site where a lesion can occur, and microbes attack. We see them with big black lesions, around where their appendages fall off, and all that is left is a big black ring."
Felder added that his team is continuing to do ent the incidents: "And from what we can tell, there is a far higher incidence we're finding after the spill."
"We are also seeing much lower diversity of crustaceans," he said. "We don't have the same number of species as we did before [the spill]."